package com.hmdp.service.impl;

import cn.hutool.core.bean.BeanUtil;
import cn.hutool.core.bean.copier.CopyOptions;
import cn.hutool.core.lang.UUID;
import cn.hutool.core.util.RandomUtil;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.hmdp.dto.LoginFormDTO;
import com.hmdp.dto.Result;
import com.hmdp.dto.UserDTO;
import com.hmdp.entity.User;
import com.hmdp.mapper.UserMapper;
import com.hmdp.service.IUserService;
import com.hmdp.utils.RedisConstants;
import com.hmdp.utils.RegexUtils;
import com.hmdp.utils.SystemConstants;
import com.hmdp.utils.UserHolder;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.connection.BitFieldSubCommands;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Service;

import javax.servlet.http.HttpSession;
import java.time.LocalDateTime;
import java.time.format.DateTimeFormatter;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.concurrent.TimeUnit;

import static com.hmdp.utils.RedisConstants.LOGIN_USER_KEY;

/**
 * <p>
 * 服务实现类
 * </p>
 *
 * @author 虎哥
 * @since 2021-12-22
 */
@Slf4j
@Service
public class UserServiceImpl extends ServiceImpl<UserMapper, User> implements IUserService {

    @Autowired
    private StringRedisTemplate stringRedisTemplate;

    @Override
    public Result sendCode(String phone, HttpSession session) {

        //校验手机号
        if(RegexUtils.isPhoneInvalid(phone)){
            //不符合返回错误信息
            return Result.fail("手机号格式错误");
        }
        //符合生成验证码
        String code = RandomUtil.randomNumbers(6);
        //保存验证码到session
//        session.setAttribute("code",code);
        //保存验证码到 redis
        stringRedisTemplate.opsForValue().set(RedisConstants.LOGIN_CODE_KEY+phone,code,RedisConstants.LOGIN_CODE_TTL, TimeUnit.MINUTES);
        //发送验证码
        log.debug("短信验证码发送成功,验证码{}",code);

        //返回ok
        return Result.ok();
    }

    @Override
    public Result login(LoginFormDTO loginForm, HttpSession session) {

        //校验手机号
        String phone = loginForm.getPhone();
        if(RegexUtils.isPhoneInvalid(phone)){
            //不符合返回错误信息
            return Result.fail("手机号格式错误");
        }

        //校验验证码
//        Object cacheCode = session.getAttribute("code");
        Object cacheCode = stringRedisTemplate.opsForValue().get(RedisConstants.LOGIN_CODE_KEY+phone);

        String code = loginForm.getCode();
        if (cacheCode == null || !cacheCode.equals(code)) {
            //不一致,报错
            return Result.fail("验证码错误");
        }

        //一致,根据手机号查询用户
        User user = query().eq("phone", phone).one();
        //判断用户是否存在
        if (user == null) {
            //不存在,创建用户,并保存
            user = createUserWithPhone(phone);
        }

        //随机生成token,作为登入令牌
        String token = UUID.randomUUID().toString(true);

        //将user对象转为HashMap对象存储
        UserDTO userDTO = BeanUtil.copyProperties(user, UserDTO.class);
        Map<String, Object> userMap = BeanUtil.beanToMap(userDTO , new HashMap<>(),
                CopyOptions.create()
                        .setIgnoreNullValue(true)
                        .setFieldValueEditor(
                                (fieldName,fieldValue) -> fieldValue.toString()
                        )
                );

        //存储
        String tokenKey = RedisConstants.LOGIN_USER_KEY+token;
        stringRedisTemplate.opsForHash().putAll(tokenKey,userMap);

        //设置token有效期
        stringRedisTemplate.expire(tokenKey,RedisConstants.LOGIN_USER_TTL, TimeUnit.MINUTES);


        return Result.ok(token);


    }

    @Override
    public Result sign() {
        //1. 获取当前用户
        Long userId = UserHolder.getUser().getId();
        //2. 获取日期
        LocalDateTime now = LocalDateTime.now();
        //3. 拼接key
        String keySuffix = now.format(DateTimeFormatter.ofPattern(":yyyyMM"));
        String key = "sign:"+userId+keySuffix;
        //4. 获取今天是本月的第几天
        int dayOfMonth = now.getDayOfMonth();
        //5. 写入redis
        stringRedisTemplate.opsForValue().setBit(key,dayOfMonth-1,true);
        return Result.ok();
    }

    @Override
    public Result signCount() {
        //1. 获取当前用户
        Long userId = UserHolder.getUser().getId();
        //2. 获取日期
        LocalDateTime now = LocalDateTime.now();
        //3. 拼接key
        String keySuffix = now.format(DateTimeFormatter.ofPattern(":yyyyMM"));
        String key = "sign:"+userId+keySuffix;
        //4. 获取今天是本月的第几天
        int dayOfMonth = now.getDayOfMonth();
        //5. 获取本月截至今天为止的签到记录,返回的是一个十进制的数字
        List<Long> result = stringRedisTemplate.opsForValue().bitField(
                key,
                BitFieldSubCommands.create()
                        .get(BitFieldSubCommands.BitFieldType.unsigned(dayOfMonth)).valueAt(0)
        );
        if (result == null || result.isEmpty()) {
            //没有任何签到结果
            return Result.ok(0);
        }
        Long num = result.get(0);
        if (num == null || num == 0) {
            return Result.ok(0);
        }
        //6. 循环遍历
        int count = 0;
        while (true) {
            //6.1. 让这个数字与1做与运算,得到数字最后一个bit位, 判断这个bit是否为0
            if ((num & 1)==0) {
                //为0说明未签到,结束
                break;
            }else {
                //如果不为0,说明已签到,计数器+1
                count++;
            }
            //把数字右移一位,抛弃最后一个bit位,继续下一个bit位
            num>>>=1;
        }

        return Result.ok(count);
    }

    private User createUserWithPhone(String phone) {
        User user = new User();
        user.setPhone(phone);
        user.setNickName(SystemConstants.USER_NICK_NAME_PREFIX +RandomUtil.randomNumbers(6));
        save(user);
        return user;
    }
}
